e. Testing the Field Coils.
(1) Replace components with damaged
(1) Test the field coils for open circuits by
threads if the threads cannot be restored.
placing the test prods of a growler in series
with each winding in turn. If the lamp does
(2) Replace the rotor if it is defective.
not light, there is an open circuit, and the
(3) Repair damaged or cracked insulation
fields must be replaced.
on the winding and the wires of the fields.
(2) Test the field coils for ground by hold-
(4) Replace the field coils if they are
ing one prod of a test lamp to the field body
shorted or open.
and touching each terminal wire in turn with
the other prod. If the test lamp lights, it indi-
if they are dry,
cates a grounded coil.
rough, or worn.
f. Testing the Stator.
(6) Replace the heads if they are cracked
(1) Use an inside growler to test the sta-
tor for a short-circuited winding.
(7) Repair or replace all other damaged or
(2) Position the growler in the stator core
(3) Hold a thin steel strip (such as a
hacksaw Blade) parallel to the core slots. Ener-
sembly of the filter pump motor.
gize the growler and explore the core surface
approximately one pole distance on either side
of the slot under test. Continue testing one
core at a time until all the coils are tested.
(1) Install the motor on the falter pump as
(4) If the coil is shorted, the metal strip
will vibrate when brought close to the affected
(2) Install the diatomite falter pump and
slot. Replace a shorted stator, or repair as ap-